Judging by that interview they're fixing the floaty jump physics. Good to know.
Again, I doubt that much. It's really impossible to fix a game to that much of a degree, when you already have the levels (and the automated scripts thereof!) already fully constructed.
...So basically, ol boy Iizuka went for this whole "DLC" avenue in the first place, because they couldn't see people spending 50-60 bucks for a 2D Sonic game on disc. Oh, and look at that! Useless enemy "air bridges" also returned! Sonic Advance 4
confirmed!

...to pic-quote a fellow of mine on NeoGAF....
